Machine employing work rolls with brake controls



April 6, 1954 P. A. BRILL ET AL MACHINE EMPLOYING WORK ROLLS WITH BRAKE CONTROLS Filed Jan. 29, 1953 Peter/1. BmZLL George EMcLwghM 7 By thew/lit 25% Patented Apr. 6, 1954 NIT-TED s r r MACHINE EMPLOYING WORKROLLS'EWITH BRAKE CONTROLS Peter A. Brill, Marblehead,

and i George E.

McLaughlin, Brookline, Mass}; assignors ,to The Turner Tanning Machinery-.Qompany; Portland, Maine, a corporation of-Maine Application January 29, 195a; -seria1'Nassam 11 Claims.

.1 This'invention relates to machines for treating sheet-materials, such'as hides' 'and skins, and more particularly, tomachines employing work rolls which. must be closedupon'the workwith such-controller closure that the workpiece is not -'marked or: gouged: thereby. This invention is disclosed as'beingembodi'ed in a shaving machine ofithetyp-e shown in Un ited states Letters Patent 'No. 1,996,877,- granted April 9, 1935 in the name" of PaulNiessen. "It is to be understood, =however, -that this invention is not, in its broader -aspects,limited to a shaving machine orto the particularwork rollactuating system herein disclosed.

in the type-of machines-wherein the work rolls -must be-brought into'their operative positions with a workpiece inserted therein, it is of extreme importance-that the action of closure be gentle in nature so that the work-pieceis not marked or gouged. In suchmachines the range of opening or closing movement of the rolls, withrespect to each: other,-.-isoften relatively smalL-particularly in a shaving machine'wherein' such-range is approximately seven-eighths of an inch. Recently improvedmeans have-been provided for ropening and closing such rolls through the use offluid motors. This has increased the abovementioned problems of marking or-gouging workpiecesinmachines of this type.

. Various expedients have beenused :to avoid the shock of closure and-consequent vmarring of the workpiece. For example, the United States Letters Patent No. 2,418,913, granted April 15, 19517-110 F. *S. Stout et; a1., a cushioning cylinder is shown .-for-reduci11gthe shock ofclosure in an ironing machine. Likewise in United States Letters Patent No. 2,586,879; granted February 26,-1952 in--the name of R. J. Stehling, hydraulic means are shown for applying pressure to the fixed'roll in a flashing machine. lhese methods of reducing the shock of bringing the workpiece carrying roll into a-gentle engagement with some type of work roll are not only difiicult and complex properly to adjust-but, more important they .tend unduly to slow down the rate of motionso that time is lost during the closing of the rolls and a production loss results therefrom.

Itisanobject of 'this invention to provide improved means for quickly. bringing a work carrying rollinto and out of operative engageinent with a work roll in such a mannerthat there is =no. gouging of the workpiece.

It .is=.-an object. of this invention to :provide braking means which are gradually increased-pea, vworkcarrying rollis brought into operativerela- :tion -to awork roll and-, to clo so, in such a manner that little or: nobraking effect isapplied during carrying roll or bedroll. Thissub-frame is" piv oted into ancl'-out :of operative engagement with a work roll or shaving roll iby means of' a fluid controlled: linkage system. Normally in operation the bed rollis in operative --relation Witlrthe shaving *roll and work "isintrodu'ced 'therein. When it is "desired =to" withdraw work, from" the 'ma'chine the operator trips the treadle which actuates "the fluid-motor and linkage system to bring the bed-roll out of operative engagement. The work: is" then' turned end for end, thetreadle is tripped and; the bed roll" is brought into operative position with "the: shaving blade I and-the workpiece-is then' reinserted: to process-the remainder-ofithe"workpiece. Under this -;,situation it is'of littleconsequenceif the bed roll-is brought into operativeengagement with the shaving roll with a great amount-of shock. However. during an operation on'the skin'oftentimes due-to ,the nature of the workpiece it is-desired momentarily to releasethe bed roll from its operative position so that said workpiece may be properly read.- justedand then toclose the-bed roll into its operative position while the-workpiece is =still inserted therein.

Insuch -cases' where the bed' roll' must be brought into operative engagementwhile the workpiece is in the machine-the closing action at the last instant of-closure must be very gentle in order to avoid. any marking or-gouging of-the leather-surface, For this'purpose, and in' accordanoewith a feature of this invention; a brake drum provided within thefluid controlled linkage system i which pivots the sub-frame to bring the; bed roll into operative position. A'1so within said linkage system is a brake band, Tone end of which attached-to alink within said system,-:and= the other endof which isyieldingly connected to the main frame of {the machine. The arrangement of the brake bandand brake drumis=suoh that'during the acceleration-pf the subframe' to pivot "it' by means" of fthe linkage system- :into operative relationsliip, ltttle on no braking force is applied to said linkage system. This arrangement allows the full power of the fluid motor to be available for overcoming the high inertia forces inherent in accelerating the pivoted sub-frame which is of a considerable mass. As the motion of the linkages continues, the braking power is progressively increased due to the arrangement connecting the brake band yieldingly to the main frame so that the large mass of the sub-frame is decelerated by the brake arrangement which absorbs and overcomes the high inertia forces of deceleration in bringing the bed roll to a stop in its operative position.

The above-described arrangement is of particular advantage in machines of this type where the extent of movement is limited and yet must be made rapidly but without allowing the members in motion to come to a stop under shock conditions.

These and other important features of the invention will now be described in detail in the specification and pointed out in the appended claims.

In the drawings,

Fig. 1 is a section through a shaving machine embodying features of the present invention;

Fig. 2 is a section taken along th line 11-11 of Fig. 1 but with certain parts omitted for the sake of clarity;

Fig. 3 is an enlarged view of some details of the machine taken along the line III-III of Fig. 2; and

Fig. 4 is a diagrammatic representation of the fluid pressure system for operatin the mechanism shown in Figs. 1 and 2.

' The machine herein disclosed and in which the present invention is embodied comprises a main frame 10 (Fig. l) and a pivoted sub-frame I2. The main frame It is of the usual configuration adopted in shaving machines as is fully described in the aforementioned Niessen patent and is generally U-shaped as viewed from the side. At the front of the machine a heavy horizontal member 14 is utilized to join the two side portions of the frame l together rigidly. Both ends of a horizontal shaft I 6 are rigidly held in the frame it! and upon the shaft I6 is pivoted the sub-frame l2, above mentioned. The latter is in the form of the letter Y having two upstanding arms although they do not appear separately in the drawings. Integral with sub-frame i2 is a depending leg 20 into which is threaded an adjusting screw 22 which in turn is axially and rotatably mounted on a rod 32. The rod 32 is integral with a T-shaped member 26 that is secured to a shaft '28 by a set screw 80. The left-hand end of the screw 22 abuts the T-shaped member 28 (Fig. 1) while a hand wheel 24 is secured to its other end. A second hand wheel 34 is threaded on the right-hand end of the shaft 32 so that its hub may engag the adjusting screw 22 and lock it in a predetermined position.

The ends of the shaft 28 are pivotally connected to theends of two links 36 and 40. The other ends of the links 38 and 40 are pivoted on pins 42 and 44 which are held in non-rotatable relation, by means of set screws 46 and 48, to two curved arms 50 and 52. These two curved arms are integral with an elongated sleeve member 58 (Fig. 2) which is freely journaled on a non-rotatable shaft 58 the ends of the latter being supported by the side portions of the frame l0. Fig. 2 shows how one end of the shaft 58-is held to a side portion of the frame it by means of a set screw 60. Lengthwise movement of the sleeve 56 is prevented in one direction by a collar 62 which is secured to the shaft 58 by a set screw 64 and in the other direction by a brake drum i0 secured to the shaft 58 by a headed key (not shown).

At the end of the sleeve member 56 abuttin the collar 62 is provided an arm 74 which is extremely heavy and rugged in construction. This arm is recessed along its length to receive an elongated member 16 which is attached to the arm 14. The outer end of the member 16 is pivotally connected by means of a pin 18 to a clevis 8!! formed on the lower end of a piston rod 82 (Fig. 1) which is part of a fluid motor 84. The cylinder of the motor 84 is pinned at 86 (Fig. l) to a bracket 88 joined to the inner surface of a side portion of the frame It.

The brake drum in is, as indicated above, fixed to the shaft 58 and is non-rotatable. Surrounding the brake drum is a brake band 13 (Fig. 3) to which is attached a customary brake lining 15. The band and lining are held in proper axial position with respect to the brake drum 10 by means of two clips 11 and 89.

Integral with the elongated sleeve member 56 is a protuberance 19 (Fig. 3) to which is secured a pin 8|. One end of the brake band '13 is looped about the pin 8| and doubled back and attached to itself. The other end of the brake band 13 bears a small bracket 83 in which a hole is formed to receive the reduced end of a threaded shaft 81. The other end of the shaft 81 is slidably mounted in an L-shaped block 90 one leg of which is secured to a stiffener rod 92 (Fig. 2). The rod 92 is an integral part of the machine frame [0, one end being attached to the frame reinforcing horizontal member l4 and the other end being attached to a part of the frame 18 which is not shown in the drawings.

A stop nut 94 is pinned to the rod 81 and abuts the bracket 83. Threaded upon the rod 81 are two lock nuts 9-5 and 98 which serve by means of a washer I00 to con ne a coil spring H12 against one end of the block 80.

The upper end of the sub-frame I2 (Fig. 1) is provided with a shelf I08, a work uidin roll I08, and a bed roll H0. The bed roll H0 is arranged to be moved into open or closed working relation with a bladed roll H2 which is journaled in the machine frame In and driven by power means, not shown in the drawing.

A wiper or flipper unit H4 is also journaled in the machine frame I0 in a suitable position and driven in the direction indicated to prevent wrapping of work about the bladed roll H2.

A foot treadle H6 is mounted at the front of the machine and is arranged to operate a pilot valve I I8 which in turn is arranged to operate a control valve I20. Fig. 4 diagrammatically illustrates the alternative directions of fluid flow through suitable connections to the fluid motor 84. The lighter lines indicate fluid flow when the treadle I I6 is tripped to bring the bed roll into its operative position and the darker lines indicate fluid flow when the treadle I I6 is tripped to bring said roll out of its operative position.

In operation, the shaving roll l 12 and the flipper unit H4 are constantly rotating in the directions indicated in Fig. l. The foot treadle H8 is depressed to operate the pilot valve H8 and the control valve I20 so that the fluid flow of this conventional arrangement causes the piston rod 82 of the fluid motor 84 to move in a downward direction so as to come to rest in the position shown in Fig. 1. During the downward move more than half of the workpiece, the machine is again cycledbytiippingthetreadle H6 so that the fluid motor 84 is operated by the flow of fluid as indicated by the heavy lines in Fig. 4 to raise the piston rod 82 and cause the sleeve 56 to rotate in a counterclockwise direction as viewed in Fig. 1. A lug I attached to a side portion of the main frame I0 is provided and disposed in the path of travel of the arm 14 to limit the extent of motion of the sleeve 56 and thereby limiting the extent of opening of the bed roll H0 through the linkage system previously explained. The brake band 13 has no tendency to retard the counterclockwise motion of the sleeve 56 since the forces and braking effect are so arranged as progressively to resist rotational motion only in a clockwise direction. In this manner the time required for opening the rolls is dependent only upon force available from the fluid motor 84 and is not affected by the braking arrangement previously described.

It will be appreciated that the braking arrangement above described operates effectively to absorb the forces of closure progressively in such a manner that the bed roll I I0 may be expeditiously brought into operative relationship with the shaving roll H2 in such a manner that no shock occurs and in the last instant of closure the action is quite gentle. As pointed out above, this is of extreme importance when it is desired to release the bed roll from its operative position to readjust a. workpiece W without removing it entirely from the machine and then to [bring said bed roll into operative position with the workpiece upon it. It will also be appreciated that the particular arrangement herein described is such that the means used to absorb the shock of closure have no tendencies to cause the bed roll H0 to move or yield out of its operative relation with the shaving roll H2.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

1. A machine for treating sheet materials including a bladed roll journaled on a main frame, a sub-frame pivoted as a unit with respect to said main frame, a bed roll journaled in said subsub-frame to bring the bed roll into cooperative or closed rlati'onto said-bladed -rollgand a brake sand on said b-rake dru'm liav-i-ng one en conne'c'ted to said main frame and the 'o'th'e nd to said s'ub frame to inov with theiatterfoi tight 1 ening'the "brake band. I

2;*Amachine for treating sheet materials ina sub-frame pivoted to said main' fram' with r; bladed r011; means "forpivotingsaid sub fraine to bring the bed roll 'in'tocooperativerelatibrf to sa' id' bladed roll, and a brake mounted for ifective 'action 1 between said main frame and sa'id sub frame.

11y e'qu'ai to theiineitia fforces arisingfrom -de- -3 A niachine for treating sheet ma'teri'als' including abladedroll journaled on a mainframe-, a

2 said sub-frame and arranged parallel'to said bladed mu, a'brake drum mounted rigidly w'ith 'respect to said mainframe; means for pivoting said sub -frame' to bringf the"bed'"rollf intocooperative relation with said bladed mu -aim a the other end pivotally connected to said subframe for movement therewith.

4. A machine for treating sheet materials including a bladed roll journaled on a main frame, a sub-frame pivoted as a unit with respect to said main frame, a bed roll carried by said sub-frame and arranged parallel to said bladed roll, a brake drum fixedly mounted with respect to said main frame, fluid pressure operated means for pivoting said sub-frame to bring the bed roll into and away from cooperative relation with said bladed roll, and a brake band on said brake drum with one end connected to said main frame and the other end being attached to said sub-frame to move therewith.

5. A machine for treating sheet materials such as hides, skins and leather including two work rolls in parallel relation, a main, frame in which one of said rolls is journaled, a sub-frame in which the second of said rolls is journaled, said subframe being arranged to pivot with respect to said main frame permitting opening and closing movements of said rolls, and a brake mounted for effective action between said main frame and said sub-frame to resist the shock of roll closure.

6. A machine for treating sheet materials including a work roll journaled on a main frame, a sub-frame pivoted as a unit with respect to said main frame, a second work roll journaled in the said sub-frame and arranged parallel to said first work roll, a shaft mounted horizontally in the base of said frame, a brake drum attached to said horizontal shaft in non-rotatable relation to said frame, and fluid pressure operative means for pivoting said sub-frame to bring the second work roll into and away from cooperative relation with said first work roll, said fluid pressure operative means comprising a fluid pressure motor, a pilot valve for controlling the said motor and a treadle for controlling the said pilot valve.

7. A machine for treating sheet materials including a main frame, a first work roll journaled insaid main frame, a sub-frame pivoted to said :main frame, a second work roll journaled in said sub-frame for opening and closing movement in,

cooperation with said first work roll, and a brake connected for efiective action between the said two frames to resist the said closing movement of the said second work roll.

8. A machine for treating sheet materials including two frames, a work roll journaled in each of said vframes, said frames being relatively movable tobring the work rolls into closed relation, means for effecting such relative movement, and a brake non-yieldingly connected by means of pivoted members to one of said frames to absorb the shock of roll closure.

9. In a machine for treating sheet materials having a work roll journaled on a main frame, a second work roll and means for bringing the second work roll into operative relation to said first work roll, a fixed brake drum, a brake band encircling said drum, and resilient means acting against a fixed member for holdin one end of said band in its encircling relationship, the other end of said band being secured to said work roll moving means in such manner that as the second roll is brought into its operative position a braking force is progressively applied to said motivating means thereby to absorb the shock of closure.

10. In a machine for treating sheet materials having a work roll journaled on a main frame, a second work roll and means for bringing the second work roll into operative relation to said first work roll, a fixed brake drum, a brake band encircling said drum; and a spring acting between a fixed member and one end of said brake band for retainin said brake band in its encircling relationship, the other end of said band being secured to the work roll motivating means in such manner that as the second roll is brought into its operative position a braking force is progressively increased to eliminate the shock of closure.

11. In a machine for treating sheet materials having a work roll, a second work roll, means for bringing said second work roll into operative relation to said first work roll comprising a fluid motor and a foot treadle for operating said motor, an elongated sleeve pivotally mounted on a fixed shaft and connected to said fiuid motor, a brake drum afiixed to said shaft, a brake band encircling said drum, one end of which is fixed to a protuberance from said sleeve, and the other end of which is yieldingly held in its encircling position by a spring abuttin a fixed member attached to said main frame, and links connecting said sleeve to a sub-frame in which the second roll is totatably mounted, whereby when the foot treadle is depressed a braking force is progressively applied to said sleeve to reduce the consequent shock of bringing said second work roll into its operative position.

No references cited. 

